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Figs. 5-A and 5-B Radiographs of hips with DM implants. Fig. 5-A IPD with a bubble sign (arrow) that is lateral to the articulation demonstrating dissociation of the polyethylene shell. Fig. 5-B True dislocation of a DM component, with a halo sign (arrow) around the ceramic femoral head demonstrating that the polyethylene shell remains intact. Used with permission of Mayo Foundation for Medical Education and Research, all rights reserved.
